# #现有字符串如下，
# 请使用切片提取出
# 1.ceg
# 2.ihgfedcba
# 3.acegi
# 4.iea
# words = "abcdefghi"
words='abcdefghi'
print(words[2:7:2])
print(words[::-1])
print(words[0:9:2])
print(words[::-4])




